125Khz Rewritable RFID Key Fob ABS Tag for Access Control
125kHz RFID Key Fob for Rewritable Access Credentials
An RFID chip key fob is a compact keychain-style RFID credential used with compatible 125 kHz readers.
This product is designed for projects that need a durable ABS key fob with either a rewritable T5577 chip or a read-only 125 kHz chip option.
A 125khz RFID key fob should be selected according to reader compatibility, chip format, programming requirement, printing method, and daily handling conditions.
Key Features
- Compact Keychain Credential
The ABS key fob format is easy to carry on a keyring, lanyard, or user badge set. - 125 kHz LF RFID Operation
Designed for close-range identification with compatible 125 kHz RFID readers. - Rewritable Chip Option
T5577 chip options can support programming or format configuration when used with compatible 125 kHz writer equipment. - Custom Visible Identification
The fob can include logo printing, laser numbering, barcode, QR code, color selection, or user-visible ID marking.
Technical Specifications
| Feature | Specification |
|---|---|
| Product Type | RFID chip key fob / 125 kHz RFID key fob |
| RFID Type | Passive LF RFID |
| Frequency | 125 kHz |
| Main Rewritable Chip | T5577 / ATA5577-type chip |
| Read-Only Chip Options | TK4100, EM4200, or EM4100-compatible options by project requirement |
| Reading Method | Close-range scan by compatible 125 kHz RFID reader |
| Writing Method | Requires compatible 125 kHz RFID writer and correct data format |
| Read Range | Up to 10 cm, depending on reader, chip, antenna, and environment |
| Material | ABS plastic |
| Shape Options | Teardrop, oval, rectangle, or custom mold by availability |
| Color Options | Blue, black, red, yellow, white, or custom color |
| Printing Options | Logo, serial number, laser ID, barcode, QR code, or custom text |
| Encoding Options | UID/code matching, ID programming, format configuration, or database association |
| Operating Temperature | -25°C to +70°C |
| MOQ | 100 pcs |
A 125 kHz RFID chip key fob is not automatically compatible with NFC, MIFARE, 13.56 MHz HF, or UHF RFID systems.
Typical Applications
- Building Access Control
Used for office doors, apartment buildings, staff entrances, and restricted areas. - Gym and Club Membership
Used by gyms, clubs, and leisure facilities to identify members at reception or entry gates. - Hotel and Resort Access
Used for guest access, staff areas, lockers, or facility permissions when the system supports 125 kHz RFID. - Time Attendance Systems
Used by employees or contractors for close-range clock-in and attendance verification. - Parking and Gate Entry
Used as a compact access credential for vehicle gates, residential parking, and controlled entry points.
Which RFID Chip Key Fob Fits Your System?
| Chip Option | Data Type | Suitable Use | Compatibility Note |
|---|---|---|---|
| T5577 | Rewritable or configurable | Systems requiring programmed or changeable 125 kHz credentials | Requires compatible reader, writer, and data format |
| TK4100 | Read-only ID | Basic access control and fixed-ID replacement | ID cannot normally be rewritten |
| EM4200 | Read-only ID | LF identification systems using EM-compatible formats | Reader output format should match software |
| EM4100-compatible | Read-only ID | Legacy 125 kHz access systems | Confirm format before bulk production |
Choose T5577 when the project needs a rewritable or configurable key fob.
Choose TK4100, EM4200, or EM4100-compatible options when the access system only requires a fixed read-only ID.
Gym Member Access Workflow with RFID Keyfobs
A gym can use RFID keyfobs to replace magnetic stripe cards or printed membership cards.
Each fob ID is linked to a member account in the gym management system.
At reception or the entrance gate, the member presents the fob to a compatible 125 kHz reader.
The software checks the member status and allows or rejects access according to the account record.
This workflow is suitable when the facility needs reusable RFID keyfobs for member identification without issuing new printed cards for every replacement.
Need RFID Keyfobs That Work with Your Existing Reader?
Send one working sample fob, the reader model, or the required data format before production.
The project can then be checked for chip compatibility, programming requirements, printing method, and whether a rewritable T5577 fob or read-only 125 kHz option is more suitable.
Sample testing is recommended when replacing existing access, gym, parking, locker, or membership credentials.
Frequently Asked Question
What is an RFID chip key fob?
An RFID chip key fob is a small keychain RFID credential with an embedded chip and antenna. It is used with compatible RFID readers for access control, membership, attendance, or identification.
Are RFID keyfobs rewritable?
Only some RFID keyfobs are rewritable. T5577 supports writable or configurable use with compatible equipment, while TK4100 and EM4200 are normally read-only options.
Can this key fob work with my existing access reader?
Only if the frequency, chip type, data format, and reader output match your system. A working sample fob or reader model should be checked before production.
What affects RFID key fob reading performance?
Reading performance depends on the chip type, reader model, antenna design, fob position, scan distance, and surrounding materials.
Get Your Custom RFID Tags
As a leading custom RFID tag manufacturer, we craft solutions based on the unique needs of your operation. We offer a wide range of customization options, including material, size, frequency, encoding, and read distance, ensuring each RFID Tag is perfectly customized to your requirements. No matter what application you use RFID tags for, we can provide rugged, reliable RFID tags that meet the highest quality and durability standards. Here are the main ways we customize RFID tags to fit your needs.
Material Selection
Material is key for customizing RFID tags. Plastic works in harsh conditions, while softer materials suit delicate spaces. Different materials also affect signal performance. Pick what fits your use case to ensure your tags last and work reliably.
Customized Size
Size shapes usability. Small tags fit tight spaces or tiny items, while larger tags are easily read. In crowded areas, sleek tags prevent clashes. Align shape and dimension with your goods for visibility, convenience, and performance.
Frequency Requirements
Choose LF, HF, or UHF based on read range, speed, and interference. LF and HF resist metals and liquids but have shorter ranges. UHF offers an extended range yet may face signal blocks. Match frequency to your environment for reliable performance.
Reading Distance
Define the distance at which you have to read the tag. Short distances work for retail checkouts, while warehouses may need meters of coverage. Antenna design, reader settings, and power outputs affect range.Adjust these factors to capture data accurately at the distance you need.
Encode
Plan how data is stored on each tag. Some only hold an ID, while others contain detailed info. Decide if you need a simple EPC or added user memory. Ensure your chosen format works with existing software. Proper encoding streamlines processes and slashes errors.
Application Environment
Consider real-world conditions. Temperature swings, humidity, and chemicals can degrade tags. For outdoor use, opt for UV-resistant casings. In healthcare or food settings, ensure compliance with safety rules. Matching your tags to the environment maximizes their lifespan.
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Customize any RFID tags from our factory to meet your requirements.
